36 
DR. A. E. H. TUTTON ON THE 
In the three following tables the morphological constants of the four salts containing 
copper are compared. The first shows that the axial angles of the ammonium and 
cfesium copper salts are almost identical, and that the axial ratios are such as place 
the ammonium salt indubitably in the same isomorphous series with the alkali-metal 
salts. 
Comparison of the Axial Angles and Axial Ratios. 
Axial angle. 
Axial ratios. 
Potassium copper sulphate . . 
Rubidium „ . ,, . . 
Ammonium „ . 
Caesium ,, ,, . . 
P- 
104° 28' 
105° 18' 
106° 9' 
106° 10' 
a : b : c 
0-7490:1:0-5088 
0-7490 : 1 : 0*5029 
0-7463 : 1 :0‘5066 
0-7429 : 1 -.0-4946 
Comparison of the Interfacial Angles. 
Angle. 
KCu sulphate. 
RbCu sulphate. 
CsCu sulphate. 
AmCu sulphate. 
Ac =(100): (001) 
o / 
75 32 
o r 
74 42 
o / 
73 50 
o / 
73 51 
as =(100):(101) 
46 11 
45 53 
45 29 
45 5 
sc =(101): (001) 
29 21 
28 49 
28 -21 
28 46 
cr =(001):(201) 
63 19 
63 30 
63 50 
64 33 
cs’ =(001): (101) 
38 22 
38 12 
38 9 
38 51 
s'r = (101) : (201) 
24 57 
25 18 
25 41 
25 42 
r’a = (201) : (100) 
41 9 
41 48 
42 20 
41 36 
fap =(100): (110) 
35 59 
35 52 
35 30 
35 38 
pp = (110):(120) 
19 28 
19 28 
19 28 
19 28 
' 
pb =(120): (010) 
34 33 
34 40 
35 2 
34 54 
PP " = (1^0) : (130) 
9 54 
9 55 
9 59 
9 58 
p'"b = (130) : (010) 
24 39 
24 45 
25 3 
24 56 
[pb =(110): (010) 
54 1 
54 8 
54 30 
54 22 
J 
r cq =(001): (Oil) 
26 11 
25 54 
25 24 
25 57 
i 
=(011): (010) 
63 49 
64 6 
64 36 
64 3 
fao =(100): (111) 
49 28 
49 5 
48 36 
48 21 
oq =(111):(Oil) 
27 35 
27 11 
26 50 
27 10 
-< 
aq =(100):(Oil) 
77 3 
76 16 
75 26 
75 31 
qo =(011):(Ill) 
34 30 
34 24 
34 28 
34 54 
(_ o'a =(111): (100) 
68 27 
69 20 
70 6 
69 35 
[co =(001): (111) 
35 6 
34 31 
33 55 
34 24 
op =(111): (110) 
43 14 
43 8 
42 59 
42 32 
-< 
cp =(001): (110) 
78 20 
77 39 
76 54 
76 56 
pd =(110):(111) 
56 58 
57 50 
58 44 
57 59 
o' c =(111): (001) 
44 42 
44 31 
44 22 
45 5 
